Britain votes

JUSTIN TALLIS, AFPGetty Images

London Mayor and newly elected Conservative Party MP for Uxbridge and Ruislip South, Boris Johnson, reacts as he walks off stage after winning his seat in Uxbridge, west London, on May 8, 2015 after votes have been counted in the British general election. Prime Minister David Cameron's Conservatives are on course to be the biggest party in the next British parliament, according to an exit poll from the general election on Thursday showing them winning far more seats than had been expected.

London Mayor and newly elected Conservative Party MP for Uxbridge and Ruislip South, Boris Johnson, reacts as he walks off stage after winning his seat in Uxbridge, west London, on May 8, 2015 after votes have been counted in the British general election. Prime Minister David Cameron's Conservatives are on course to be the biggest party in the next British parliament, according to an exit poll from the general election on Thursday showing them winning far more seats than had been expected.

(JUSTIN TALLIS, AFPGetty Images)

London Mayor and newly elected Conservative Party MP for Uxbridge and Ruislip South, Boris Johnson, reacts as he walks off stage after winning his seat in Uxbridge, west London, on May 8, 2015 after votes have been counted in the British general election. Prime Minister David Cameron's Conservatives are on course to be the biggest party in the next British parliament, according to an exit poll from the general election on Thursday showing them winning far more seats than had been expected.